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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        a {
            text-decoration: none;
            display: block;
        }
        .con {
            position: relative; 
            width: 400px;
            /* height: 400px; */
        }
        .con .item {
            width: 100%;
            height: 100%;
        }
        .con .item img {
            width: 100%;
        }
        .play-btn {
            opacity: 0;
            position: absolute;
            width: 56px;
            height: 56px;
            right: 10%;
            bottom: 10%;
            background: url(images/播放.png) no-repeat center center; 
            transition: opacity .5s ease-in-out .5s;
           }
           con:hover .play-btn {
            opacity: 1;
           }
           .mask {
            width: 100%;
            height: 0;
            position: absolute;
            bottom: 0;
            transition: height .5s ease-in-out;
            overflow: hidden;
           }
           .con:hover .mask {
            height: 100%;

           }
    </style>
</head>
<body>
    <div class="con"> 
        <a href="C:\Users\逯博\Videos\白月光.mp4" target="_blank" class="item">
            <img src="images/遥远的她.jpg" alt="">
        </a>
        <a href="C:\Users\逯博\Videos\白月光.mp4" target="_blank" class="play-btn"></a>
        <a href="C:\Users\逯博\Videos\白月光.mp4" target="_blank" class="mask">
        <h1>他在哪里了</h1>
        <p>远方的他，正无语凝眸，望眼欲穿。。。</p>
        </a> 
    </div>
</body>
</html>